Base structure.
Returns true (1) if the preference with the specified |name| can be modified using SetPreference. As one example preferences set via the command-line usually cannot be modified. This function must be called on the browser process UI thread.
Returns all preferences as a dictionary. If |include_defaults| is true (1) then preferences currently at their default value will be included. The returned object contains a copy of the underlying preference values and modifications to the returned object will not modify the underlying preference values. This function must be called on the browser process UI thread.
Returns the value for the preference with the specified |name|. Returns NULL if the preference does not exist. The returned object contains a copy of the underlying preference value and modifications to the returned object will not modify the underlying preference value. This function must be called on the browser process UI thread.
Returns true (1) if a preference with the specified |name| exists. This function must be called on the browser process UI thread.
Set the |value| associated with preference |name|. Returns true (1) if the value is set successfully and false (0) otherwise. If |value| is NULL the preference will be restored to its default value. If setting the preference fails then |error| will be populated with a detailed description of the problem. This function must be called on the browser process UI thread.